Tucana Dwarf - Revision history

Merajul Islam: Created page with "{{short description|Dwarf galaxy in the constellation Tucana}} {{Infobox Galaxy | image = Tucana Dwarf Hubble WikiSky.jpg | image_size = 250px | caption = Tucana Dwarf by HST | credit = | name = Tucana Dwarf | epoch = J2000 | type = dE4{{cite web | title=NASA/IPAC Extragalactic Database | work=Results for Tucana Dwarf | url=http://nedwww.ipac.caltech.edu/ | access-date=2006-11-29 }} | ra = {{RA|22|41|49.0}}
2022-01-28T14:58:16Z

Created page with "{{short description|Dwarf galaxy in the constellation Tucana}} {{Infobox Galaxy | image = Tucana Dwarf Hubble WikiSky.jpg | image_size = 250px | caption = Tucana Dwarf by HST | credit = | name = Tucana Dwarf | epoch = J2000 | type = dE4<ref name="ned">{{cite web | title=NASA/IPAC Extragalactic Database | work=Results for Tucana Dwarf | url=http://nedwww.ipac.caltech.edu/ | access-date=2006-11-29 }}</ref> | ra = {{RA|22|41|49.0}}<re..."

← Older revision Revision as of 20:28, 28 January 2022
Line 24: Line 24:

The '''Tucana Dwarf Galaxy''' is a [[dwarf galaxy]] in the [[constellation]] [[Tucana]]. It was discovered in 1990 by R.J. Lavery of [[Mount Stromlo Observatory]]. It is composed of very old stars and is very isolated from other galaxies. Its location on the opposite side of the Milky Way from other [[Local Group]] galaxies makes it an important object for study.
The '''Tucana Dwarf Galaxy''' is a [[dwarf galaxy]] in the [[constellation]] [[Tucana]]. It was discovered in 1990 by R.J. Lavery of [[Mount Stromlo Observatory]]. It is composed of very old stars and is very isolated from other galaxies. Its location on the opposite side of the Milky Way from other [[Local Group]] galaxies makes it an important object for study.

==Properties==
[[Merajul Islam]]

The Tucana Dwarf is a [[dwarf spheroidal galaxy]] of [[Galaxy morphological classification|type dE5]].<ref name="LaveryMighell1992"/> It contains only old stars, formed in a single [[star formation]] era around the time the Milky Way's [[globular cluster]]s formed.<ref name="SavianeEtAl1996"/> It is not experiencing any current star formation, unlike other isolated dwarf galaxies.<ref name="vandenbergh1994"/>

The Tucana Dwarf does not contain very much neutral [[hydrogen]] gas.<ref name="OosterlooEtAl1996"/> It has a [[metallicity]] of -1.8, a significantly low number. There is no significant spread in metallicity throughout the galaxy.<ref name="SavianeEtAl1996"/> There does not seem to be any substructure to the stellar distribution in the galaxy.<ref name="SavianeEtAl1996"/>

==Location==

The Tucana Dwarf is located in the constellation Tucana. It is about {{convert|870|kpc|kly}} away,<ref name="vandenbergh2000"/> on the opposite side of the [[Milky Way]] galaxy to most of the other [[Local Group]] galaxies and is therefore important for understanding the kinematics and formation history of the Local Group,<ref name="LaveryMighell1992"/> as well as the role of environment in determining how dwarf galaxies evolve. It is isolated from other galaxies,<ref name="LaveryMighell1992"/> and located near the edge of the Local Group,<ref name="SavianeEtAl1996"/> around {{convert|1100|kpc|kly}} from the barycentre of the Local Group—the second most remote of all member galaxies after the [[Sagittarius Dwarf Irregular Galaxy]].<ref name="vandenbergh2000"/>

The Tucana Dwarf galaxy is one of only two dwarf spheroidal galaxies in the Local Group not located near the Milky Way or the [[Andromeda Galaxy]].<ref name="FraternaliEtAl2009"/> It is therefore likely to have evolved in isolation for most of its history.<ref name="vandenbergh2000"/>

==References==

{{reflist|refs=

<ref name="LaveryMighell1992">{{Cite journal

| doi = 10.1086/116042

| last = Lavery

| first = Russell J.

|author2=Mighell, Kenneth J.

| title = A new member of the Local Group - The Tucana dwarf galaxy

| journal = [[The Astronomical Journal]]

| volume = 103

| issue = 1

| pages = 81–84

| date = January 1992

| bibcode = 1992AJ....103...81L}}</ref>

<ref name="FraternaliEtAl2009">{{Cite journal

| last1 = Fraternali | first1 = F.

| last2 = Tolstoy | first2 = E.

| last3 = Irwin | first3 = M. J.

| last4 = Cole | first4 = A. A.

| title = Life at the periphery of the Local Group: the kinematics of the Tucana dwarf galaxy

| journal = [[Astronomy and Astrophysics]]

| date = May 2009

| volume = 499

| issue = 1

| pages = 121–128

| bibcode = 2009A&A...499..121F|doi = 10.1051/0004-6361/200810830 |arxiv = 0903.4635 | s2cid = 18698184

}}</ref>

<ref name="OosterlooEtAl1996">{{Cite journal

| doi = 10.1086/118155

| last1 = Oosterloo | first1 = T.

| last2 = Da Costa | first2 = G. S.

| last3 = Staveley-Smith | first3 = L.

| title = HI Observations of the Tucana Dwarf Elliptical Galaxy

| journal = [[The Astronomical Journal]]

| volume = 112

| issue = 5

| pages = 1969–1974

| date = November 1996

| bibcode = 1996AJ....112.1969O}}</ref>

<ref name="SavianeEtAl1996">{{Cite journal

| last1 = Saviane | first1 = I.

| last2 = Held | first2 = E. V.

| last3 = Piotto | first3 = G.

| title = CCD photometry of the Tucana dwarf galaxy.

| journal = Astronomy and Astrophysics

| volume = 315

| pages = 40–51

| date = November 1996

| bibcode = 1996A&A...315...40S|arxiv = astro-ph/9601165 }}</ref>

<ref name="vandenbergh1994">{{Cite journal

| doi = 10.1086/174270

| last = van den Bergh

| first = Sidney

| title = The evolutionary history of low-luminosity local group dwarf galaxies

| journal = [[The Astrophysical Journal]]

| volume = 428

| pages = 617–619

| date = June 1994

| bibcode = 1994ApJ...428..617V}}</ref>

<ref name="vandenbergh2000">{{Cite journal

| last1 = van den Bergh

| first1 = Sidney

| authorlink1 = Sidney van den Bergh

| title = Updated Information on the Local Group

| date = April 2000

| journal = [[The Publications of the Astronomical Society of the Pacific]]

| volume = 112

| issue = 770

| pages = 529–536

| bibcode = 2000PASP..112..529V

| doi = 10.1086/316548

|arxiv = astro-ph/0001040 | s2cid = 1805423

}}</ref>

}}

==External links==

* [https://web.archive.org/web/20051116070034/http://www.aas.org/publications/baas/v28n2/aas188/abs/S009003.html The Tucana Dwarf Galaxy: HST/WFPC2 Imaging of this Isolated Local Group Dwarf Spheroidal] (AAS)

*{{WikiSky|name=The Tucana Dwarf}}

{{Sky|22|41|49.0|-|64|25|12|3200000}}

{{Tucana}}

{{Authority control}}

{{DEFAULTSORT:Tucana Dwarf}}

[[Category:Dwarf galaxies]]

[[Category:Dwarf elliptical galaxies]]

[[Category:Local Group]]

[[Category:Tucana (constellation)]]

[[Category:Principal Galaxies Catalogue objects|69519]]

[[Category:Astronomical objects discovered in 1990]]

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2021-10-29T21:55:50Z

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New page

{{short description|Dwarf galaxy in the constellation Tucana}}
{{Infobox Galaxy
| image = Tucana Dwarf Hubble WikiSky.jpg
| image_size = 250px
| caption = Tucana Dwarf by [[Hubble Space Telescope|HST]]
| credit =
| name = Tucana Dwarf
| epoch = [[J2000]]
| type = dE4<ref name="ned">{{cite web
| title=NASA/IPAC Extragalactic Database
| work=Results for Tucana Dwarf
| url=http://nedwww.ipac.caltech.edu/
| access-date=2006-11-29 }}</ref>
| ra = {{RA|22|41|49.0}}<ref name="ned" />
| dec = {{DEC|-64|25|12}}<ref name="ned" />
| dist_ly = [[1 E22 m|3.2]] [[light-year|Mly]]
| z = 130 ± ? km/[[second|s]]<ref name="ned" />
| appmag_v = 15.7<ref name="ned" />
| size_v = 2′.9 × 1′.2<ref name="ned" />
| constellation name = [[Tucana]]
| notes =
| names = [[Principal Galaxies Catalogue|PGC]] 69519<ref name="ned" /> }}

The '''Tucana Dwarf Galaxy''' is a [[dwarf galaxy]] in the [[constellation]] [[Tucana]]. It was discovered in 1990 by R.J. Lavery of [[Mount Stromlo Observatory]]. It is composed of very old stars and is very isolated from other galaxies. Its location on the opposite side of the Milky Way from other [[Local Group]] galaxies makes it an important object for study.

==Properties==

The Tucana Dwarf is a [[dwarf spheroidal galaxy]] of [[Galaxy morphological classification|type dE5]].<ref name="LaveryMighell1992"/> It contains only old stars, formed in a single [[star formation]] era around the time the Milky Way's [[globular cluster]]s formed.<ref name="SavianeEtAl1996"/> It is not experiencing any current star formation, unlike other isolated dwarf galaxies.<ref name="vandenbergh1994"/>

The Tucana Dwarf does not contain very much neutral [[hydrogen]] gas.<ref name="OosterlooEtAl1996"/> It has a [[metallicity]] of -1.8, a significantly low number. There is no significant spread in metallicity throughout the galaxy.<ref name="SavianeEtAl1996"/> There does not seem to be any substructure to the stellar distribution in the galaxy.<ref name="SavianeEtAl1996"/>

==Location==

The Tucana Dwarf is located in the constellation Tucana. It is about {{convert|870|kpc|kly}} away,<ref name="vandenbergh2000"/> on the opposite side of the [[Milky Way]] galaxy to most of the other [[Local Group]] galaxies and is therefore important for understanding the kinematics and formation history of the Local Group,<ref name="LaveryMighell1992"/> as well as the role of environment in determining how dwarf galaxies evolve. It is isolated from other galaxies,<ref name="LaveryMighell1992"/> and located near the edge of the Local Group,<ref name="SavianeEtAl1996"/> around {{convert|1100|kpc|kly}} from the barycentre of the Local Group—the second most remote of all member galaxies after the [[Sagittarius Dwarf Irregular Galaxy]].<ref name="vandenbergh2000"/>

The Tucana Dwarf galaxy is one of only two dwarf spheroidal galaxies in the Local Group not located near the Milky Way or the [[Andromeda Galaxy]].<ref name="FraternaliEtAl2009"/> It is therefore likely to have evolved in isolation for most of its history.<ref name="vandenbergh2000"/>

==References==

{{reflist|refs=
<ref name="LaveryMighell1992">{{Cite journal
| doi = 10.1086/116042
| last = Lavery
| first = Russell J.
|author2=Mighell, Kenneth J.
| title = A new member of the Local Group - The Tucana dwarf galaxy
| journal = [[The Astronomical Journal]]
| volume = 103
| issue = 1
| pages = 81–84
| date = January 1992
| bibcode = 1992AJ....103...81L}}</ref>

<ref name="FraternaliEtAl2009">{{Cite journal
| last1 = Fraternali | first1 = F.
| last2 = Tolstoy | first2 = E.
| last3 = Irwin | first3 = M. J.
| last4 = Cole | first4 = A. A.
| title = Life at the periphery of the Local Group: the kinematics of the Tucana dwarf galaxy
| journal = [[Astronomy and Astrophysics]]
| date = May 2009
| volume = 499
| issue = 1
| pages = 121–128
| bibcode = 2009A&A...499..121F|doi = 10.1051/0004-6361/200810830 |arxiv = 0903.4635 | s2cid = 18698184
}}</ref>

<ref name="OosterlooEtAl1996">{{Cite journal
| doi = 10.1086/118155
| last1 = Oosterloo | first1 = T.
| last2 = Da Costa | first2 = G. S.
| last3 = Staveley-Smith | first3 = L.
| title = HI Observations of the Tucana Dwarf Elliptical Galaxy
| journal = [[The Astronomical Journal]]
| volume = 112
| issue = 5
| pages = 1969–1974
| date = November 1996
| bibcode = 1996AJ....112.1969O}}</ref>

<ref name="SavianeEtAl1996">{{Cite journal
| last1 = Saviane | first1 = I.
| last2 = Held | first2 = E. V.
| last3 = Piotto | first3 = G.
| title = CCD photometry of the Tucana dwarf galaxy.
| journal = Astronomy and Astrophysics
| volume = 315
| pages = 40–51
| date = November 1996
| bibcode = 1996A&A...315...40S|arxiv = astro-ph/9601165 }}</ref>

<ref name="vandenbergh1994">{{Cite journal
| doi = 10.1086/174270
| last = van den Bergh
| first = Sidney
| title = The evolutionary history of low-luminosity local group dwarf galaxies
| journal = [[The Astrophysical Journal]]
| volume = 428
| pages = 617–619
| date = June 1994
| bibcode = 1994ApJ...428..617V}}</ref>

<ref name="vandenbergh2000">{{Cite journal
| last1 = van den Bergh
| first1 = Sidney
| authorlink1 = Sidney van den Bergh
| title = Updated Information on the Local Group
| date = April 2000
| journal = [[The Publications of the Astronomical Society of the Pacific]]
| volume = 112
| issue = 770
| pages = 529–536
| bibcode = 2000PASP..112..529V
| doi = 10.1086/316548
|arxiv = astro-ph/0001040 | s2cid = 1805423
}}</ref>

}}

==External links==
* [https://web.archive.org/web/20051116070034/http://www.aas.org/publications/baas/v28n2/aas188/abs/S009003.html The Tucana Dwarf Galaxy: HST/WFPC2 Imaging of this Isolated Local Group Dwarf Spheroidal] (AAS)
*{{WikiSky|name=The Tucana Dwarf}}

{{Sky|22|41|49.0|-|64|25|12|3200000}}
{{Tucana}}

{{Authority control}}

{{DEFAULTSORT:Tucana Dwarf}}
[[Category:Dwarf galaxies]]
[[Category:Dwarf elliptical galaxies]]
[[Category:Local Group]]
[[Category:Tucana (constellation)]]
[[Category:Principal Galaxies Catalogue objects|69519]]
[[Category:Astronomical objects discovered in 1990]]

← Older revision		Revision as of 20:28, 28 January 2022
Line 24:		Line 24:
	The '''Tucana Dwarf Galaxy''' is a [[dwarf galaxy]] in the [[constellation]] [[Tucana]]. It was discovered in 1990 by R.J. Lavery of [[Mount Stromlo Observatory]]. It is composed of very old stars and is very isolated from other galaxies. Its location on the opposite side of the Milky Way from other [[Local Group]] galaxies makes it an important object for study.		The '''Tucana Dwarf Galaxy''' is a [[dwarf galaxy]] in the [[constellation]] [[Tucana]]. It was discovered in 1990 by R.J. Lavery of [[Mount Stromlo Observatory]]. It is composed of very old stars and is very isolated from other galaxies. Its location on the opposite side of the Milky Way from other [[Local Group]] galaxies makes it an important object for study.

	~~==Properties==~~		[[Merajul Islam]]

	~~The Tucana Dwarf is a~~ [[dwarf spheroidal galaxy]] of [[Galaxy morphological classification\|type dE5]].<ref name="LaveryMighell1992"/> It contains only old stars, formed in a single [[star formation]] era around the time the Milky Way's [[globular cluster]]s formed.<ref name="SavianeEtAl1996"/> It is not experiencing any current star formation, unlike other isolated dwarf galaxies.<ref name="vandenbergh1994"/>

	The Tucana Dwarf does not contain very much neutral [[hydrogen]] gas.<ref name="OosterlooEtAl1996"/> It has a [[metallicity]] of -1.8, a significantly low number. There is no significant spread in metallicity throughout the galaxy.<ref name="SavianeEtAl1996"/> There does not seem to be any substructure to the stellar distribution in the galaxy.<ref name="SavianeEtAl1996"/>

	~~==Location==~~

	The Tucana Dwarf is located in the constellation Tucana. It is about {{convert\|870\|kpc\|kly}} away,<ref name="vandenbergh2000"/> on the opposite side of the [[Milky Way]] galaxy to most of the other [[Local Group]] galaxies and is therefore important for understanding the kinematics and formation history of the Local Group,<ref name="LaveryMighell1992"/> as well as the role of environment in determining how dwarf galaxies evolve. It is isolated from other galaxies,<ref name="LaveryMighell1992"/> and located near the edge of the Local Group,<ref name="SavianeEtAl1996"/> around {{convert\|1100\|kpc\|kly}} from the barycentre of the Local Group—the second most remote of all member galaxies after the [[Sagittarius Dwarf Irregular Galaxy]].<ref name="vandenbergh2000"/>

	The Tucana Dwarf galaxy is one of only two dwarf spheroidal galaxies in the Local Group not located near the Milky Way or the [[Andromeda Galaxy]].<ref name="FraternaliEtAl2009"/> It is therefore likely to have evolved in isolation for most of its history.<ref name="vandenbergh2000"/>

	~~==References==~~

	~~{{reflist\|refs=~~
	~~<ref name="LaveryMighell1992">{{Cite journal~~
	~~\| doi = 10.1086/116042~~
	~~\| last = Lavery~~
	~~\| first = Russell J.~~
	~~\|author2=Mighell, Kenneth J.~~
	~~\| title = A new member of the Local Group - The Tucana dwarf galaxy~~
	~~\| journal = [[The Astronomical Journal]]~~
	~~\| volume = 103~~
	~~\| issue = 1~~
	~~\| pages = 81–84~~
	~~\| date = January 1992~~
	~~\| bibcode = 1992AJ....103...81L}}</ref>~~

	~~<ref name="FraternaliEtAl2009">{{Cite journal~~
	~~\| last1 = Fraternali \| first1 = F.~~
	~~\| last2 = Tolstoy \| first2 = E.~~
	~~\| last3 = Irwin \| first3 = M. J.~~
	~~\| last4 = Cole \| first4 = A. A.~~
	~~\| title = Life at the periphery of the Local Group: the kinematics of the Tucana dwarf galaxy~~
	~~\| journal = [[Astronomy and Astrophysics]]~~
	~~\| date = May 2009~~
	~~\| volume = 499~~
	~~\| issue = 1~~
	~~\| pages = 121–128~~
	~~\| bibcode = 2009A&A...499..121F\|doi = 10.1051/0004-6361/200810830 \|arxiv = 0903.4635 \| s2cid = 18698184~~
	~~}}</ref>~~

	~~<ref name="OosterlooEtAl1996">{{Cite journal~~
	~~\| doi = 10.1086/118155~~
	~~\| last1 = Oosterloo \| first1 = T.~~
	~~\| last2 = Da Costa \| first2 = G. S.~~
	~~\| last3 = Staveley-Smith \| first3 = L.~~
	~~\| title = HI Observations of the Tucana Dwarf Elliptical Galaxy~~
	~~\| journal = [[The Astronomical Journal]]~~
	~~\| volume = 112~~
	~~\| issue = 5~~
	~~\| pages = 1969–1974~~
	~~\| date = November 1996~~
	~~\| bibcode = 1996AJ....112.1969O}}</ref>~~

	~~<ref name="SavianeEtAl1996">{{Cite journal~~
	~~\| last1 = Saviane \| first1 = I.~~
	~~\| last2 = Held \| first2 = E. V.~~
	~~\| last3 = Piotto \| first3 = G.~~
	~~\| title = CCD photometry of the Tucana dwarf galaxy.~~
	~~\| journal = Astronomy and Astrophysics~~
	~~\| volume = 315~~
	~~\| pages = 40–51~~
	~~\| date = November 1996~~
	~~\| bibcode = 1996A&A...315...40S\|arxiv = astro-ph/9601165 }}</ref>~~

	~~<ref name="vandenbergh1994">{{Cite journal~~
	~~\| doi = 10.1086/174270~~
	~~\| last = van den Bergh~~
	~~\| first = Sidney~~
	~~\| title = The evolutionary history of low-luminosity local group dwarf galaxies~~
	~~\| journal = [[The Astrophysical Journal]]~~
	~~\| volume = 428~~
	~~\| pages = 617–619~~
	~~\| date = June 1994~~
	~~\| bibcode = 1994ApJ...428..617V}}</ref>~~

	~~<ref name="vandenbergh2000">{{Cite journal~~
	~~\| last1 = van den Bergh~~
	~~\| first1 = Sidney~~
	~~\| authorlink1 = Sidney van den Bergh~~
	~~\| title = Updated Information on the Local Group~~
	~~\| date = April 2000~~
	~~\| journal = [[The Publications of the Astronomical Society of the Pacific]]~~
	~~\| volume = 112~~
	~~\| issue = 770~~
	~~\| pages = 529–536~~
	~~\| bibcode = 2000PASP..112..529V~~
	~~\| doi = 10.1086/316548~~
	~~\|arxiv = astro-ph/0001040 \| s2cid = 1805423~~
	~~}}</ref>~~

	}}

	~~==External links==~~
	* [https://web.archive.org/web/20051116070034/http://www.aas.org/publications/baas/v28n2/aas188/abs/S009003.html The Tucana Dwarf Galaxy: HST/WFPC2 Imaging of this Isolated Local Group Dwarf Spheroidal] (AAS)
	*{{WikiSky\|name=The Tucana Dwarf}}

	~~{{Sky\|22\|41\|49.0\|-\|64\|25\|12\|3200000}}~~
	~~{{Tucana}}~~

	~~{{Authority control}}~~

	~~{{DEFAULTSORT:Tucana Dwarf}}~~
	~~[[Category:Dwarf galaxies]]~~
	~~[[Category:Dwarf elliptical galaxies]]~~
	~~[[Category:Local Group]]~~
	~~[[Category:Tucana (constellation)]]~~
	~~[[Category:Principal Galaxies Catalogue objects\|69519]]~~
	~~[[Category:Astronomical objects discovered in 1990~~]]